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Pension plans (Tables)
 6 Months Ended
Aug. 01, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic pension cost for the UK Plan are as follows:
 
13 weeks ended
 
26 weeks ended
(in millions)
August 1, 2015
 
August 2, 2014
 
August 1, 2015
 
August 2, 2014
Components of net periodic pension benefit (cost):
 
 
 
 
 
 
 
Service cost
$
(0.7
)
 
$
(0.6
)
 
$
(1.3
)
 
$
(1.2
)
Interest cost
(2.0
)
 
(2.5
)
 
(3.9
)
 
(5.0
)
Expected return on UK Plan assets
3.0

 
3.7

 
5.8

 
7.5

Amortization of unrecognized net prior service credit
0.6

 
0.5

 
1.1

 
0.9

Amortization of unrecognized actuarial loss
(0.9
)
 
(0.5
)
 
(1.7
)
 
(1.0
)
Net periodic pension benefit
$
—

 
$
0.6

 
$
—

 
$
1.2